Hello Thanks for query . You are married since 3 years and trying for baby hoever failed due to problem of ED that your husband is facing , The conception results from a successful intercourse between the couple with good health and normal parameters of semen like sperm count ,motility and morphology and normal ovulation cycle of a female partner . Both of you need to consult Gynecologist and Urologist for detail investigation and get following basic tests done to trace outany abnormality 1) Blood sugar levels 2) Thyroid hormone assessment 3) Semen Analysis 4) Ultrasound scanning of abdomen (Wife )to rule out Poly Cystic Ovarian Disease (POCD). 5) Female hormonal assessment Hormonal . Further treatment will depend upon the results of these tests . Your Hhusband needs to take Sildenafil (Viagra) or Cialis as on demand .It will help him to get good hard sustainable erection and to have enjoyable sex. Dr.Patil.